Polyhedral model



FIG. 1 illustrates a perspective view of a polyhedral model corresponding to a rotated elevational view rotated approximately 15° about an x-axis and 45° about a y-axis.

FIG. 2 illustrates a perspective view of the polyhedral model of FIG. 1 rotated approximately 45° about an x-axis; and,

FIG. 3 illustrates a perspective view of the polyhedral model of FIG. 1 rotated approximately 70° about an x-axis. 

The ornamental design for a polyhedral model, as shown and described. 